#quiz {
  width: 750px;
  background: rgba(0,0,0,0.75);
  color: white;
  padding: 20px;
  border-radius: 12px;
}

.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 15px;
}

/* tracker boxes */

#tracker span {
  display: inline-block;
  margin: 0 3px;
  padding: 5px 8px;
  border-radius: 5px;
  background: #444;
  font-size: 12px;
}

#tracker span.active {
  background: #2563eb;
  font-weight: bold;
}

#tracker span.done {
  background: #22c55e;
}

/* question options */

.option {
  display: block;
  margin: 10px 0;
  padding: 12px;
  background: #222;
  border-radius: 6px;
  cursor: pointer;
  border: 1px solid transparent;
}

.option:hover {
  background: #333;
}

.option.correct {
  background: #16a34a;
}

.option.wrong {
  background: #dc2626;
}

/* buttons */

#nextBtn,
#endBtn {
  margin-top: 15px;
}